Improvement in lathe-chucks



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Letters Patent No. 110,903, dated January 10, 1871.

iMPRovEMEN-r IN LA'rHE-cHucKs.

TheSchedule referred yto in these Lettere Patent and making part of the same.

I, AUSTIN F. OUSHMAN, of Hartford, in the county of Hartford and State of Connecticut, have invented certain Improvements in Lathe-Chucks, of which the following is a specification.

Nature and Objects of the Invention.

My invention relates to chucks for lathes; and

rlhe invention consists in a novel construction of a' combined pinion and screw for moving the jaws, -and in a novel method of support-ing said screws and pinions in the shell.

It further consists in providing the shell with an annular disk, so arranged as to serve as a cover for the back side of the shell, and also as a means of connecting and disconnecting the several screws and pinions by a circular rack mounted on said disk, all as hereinplate of the chuck,

j General Description. A A A" arcthe jaws, which have grooves a to slide on the projections l1, in and out, upon the center of the chuck.

The backs of these jaws are cut into a gear or rack which works upon the worms `H H. These jaws can slide out and be reversed, to use either end.

lhe inner and outer ends of the jaws and the several faces ofthe projections are each turned off to two different curves, c and e, one to be vused when one end of the jaw is toward the center and the other when re versed, andare so arranged thateither projection can be used either for au inside lor an'outside support for the work.

B is the front plate or body of the chuck, into which all the parts are titted, and which' has the holes K K' K.I through it for the purpose of bolting it to the faceplate ot' a lathe, also a hole L throughA the center.

O is the back-plate, which has a screw-thread cut around its rim and screws into the back edgeof the body B.

D is an annular' movable collar, turning on a central l core which forms part of the body B, and lying against the back-plate C, to which it is confined by the slips F, moving in a groove in the outer edge of the collar D. These allowthe ring or collar to turn freely, but hold it closely in contact with the plate G.

On the front of D iscut the circulanrack E, in which works the three Apinions G under the jaws.

Thesepinions are cut ou thearbors I, which rest in semicircular bearings in the body B, and have a keysquare, J, at the outer end.

The worm H H'is formed of two parts screwed onto the arbor I and secured by a piu.

The worm is then cut continuously through the two parts H H', andts into the screw-thread in theback of the jaw. l

Y The worm and pinionhwith the arbor, resting in the half-circle bearings, cau be easily removed and re-` placed through the opening in the face when the jaw is taken out.

M- is a set-screw for holding the back-plate O -inany position. i A Y N is a handle for assisting inv turning the back-plate out or in on the screw-thread cut in its rim.'

When the jaw A" ofthe chuck, shown vas removed,

' is replaced in the same position as A and A', anda key is applied to either of the heads J 9i' the arbors I, the motionis conveyed, by means of the rack E, tov the other arbors, and the worms move the jaw out or in together, forming a universal chuck.

lIf it isdesired to have the jaws move independently to t Aan irregular piece of work, the set-screw M is loosened and the back-plate Gis unscrewed until the rack E is raised out from the teeth of the pinions G,

`when the'plate G can be reclamped. Eachof the jaws can then be Vmoved separately bythe key applied to the vsquare of the worm-arbor.

It it is desired to have the jaws move out and in eccentrically, they are placed in the proper relative position while'the rack is ungeared'. It is then replaced in the pinions by screwing in the back-plate O, when Athe keyr applied to one of the arbors will move the jaws ontand in with the same relative position.

Claims.

I claim as my inventionl 1. The combined screw and bevel pinion, consisting of a rod having the pinion G formed thereon, and the screws H and H secured upon the rod on opposite sides of the pinion, substantially as set forth.

2. The shell B, havingarecess formed'underueath the sliding jaws with semiciroular bearings at each`end, in combination with the combined screw and pinion having corresponding journals at its ends, and the jaw A having a continuous screw-thread cnt in its under side,

all arranged to operate as herein described.

3. In combination with the subject matter of the second claim, the plate B, screw-threaded on its periphery, the annular rack D, and the clips F, as described.

AUSTIN F. OUSHMAN.

Witnesses.. Y

THEO. G. ELLIS, W. E. Smonns. 

